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| author | alfred <alfred@FreeBSD.org> | 1999-12-13 02:28:53 +0000 |
|---|---|---|
| committer | alfred <alfred@FreeBSD.org> | 1999-12-13 02:28:53 +0000 |
| commit | 8a21e37554bb51157840405b76b020bfbd5b442b (patch) | |
| tree | 25c582fb49021a8295ff0a90a182cae87de6eb4e /share/man/man9/VOP_RDWR.9 | |
| parent | ce079123e3550908356dfbaf3f42672876a55777 (diff) | |
| download | FreeBSD-src-8a21e37554bb51157840405b76b020bfbd5b442b.zip FreeBSD-src-8a21e37554bb51157840405b76b020bfbd5b442b.tar.gz | |
explain that ioflags can be used to give read-ahead hints to the underlying
filesystem.
Diffstat (limited to 'share/man/man9/VOP_RDWR.9')
| -rw-r--r-- | share/man/man9/VOP_RDWR.9 | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/share/man/man9/VOP_RDWR.9 b/share/man/man9/VOP_RDWR.9 index 5e67262..a1e28fd 100644 --- a/share/man/man9/VOP_RDWR.9 +++ b/share/man/man9/VOP_RDWR.9 @@ -60,7 +60,11 @@ the credentials of the caller .Pp The .Fa ioflag -argument is a bit mask which can contain the following flags: +argument is used to give directives and hints to the filesystem. +When attempting a read, the high 16 bits are used to provide a +read-ahead hint (in units of filesystem blocks) that the filesystem +should attempt. The low 16 bits are a bit mask which can contain +the following flags: .Bl -tag -width IO_NODELOCKED .It Dv IO_UNIT do I/O as atomic unit |
